diff --git a/Day 18/README.md b/Day 18/README.md
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+# Day 18 - Turtle & the Graphical User Interface (GUI)
+
+- Developed various basic turtle graphics.
+  - Spirograph, random walk, various polygons, dashed line, and square.
+- Formed a dot art based on Hirst artwork.
+
+## Dot art
+
+![Day_18_Dot_Art](https://user-images.githubusercontent.com/30333942/128644328-9128d1b2-e416-4daf-ba05-cc37c2cff9ee.gif)
+
+## Spirograph
+
+![Day_18_Spirograph](https://user-images.githubusercontent.com/30333942/128644332-0aad8f64-5d71-4579-9c53-07333bb38233.gif)
+
+## Random Walk
+
+![Day_18_Random_Walk](https://user-images.githubusercontent.com/30333942/128644335-00899537-04b9-4f88-bcd6-46b7590082fe.gif)
+
+## Polygons
+
+![Day_18_Polygons](https://user-images.githubusercontent.com/30333942/128644338-23011edc-6246-49c2-9574-0f5e0497bcb6.gif)
+
+## Dashed Line
+
+![Day_18_Dashed_Line](https://user-images.githubusercontent.com/30333942/128644340-dff27a27-a6e1-44d3-95c0-9f885f9771b2.gif)
+
+## Square
+
+![Day_18_Square](https://user-images.githubusercontent.com/30333942/128644342-746c14cf-86f2-47c0-ae93-b3df1bf32b13.gif)
diff --git a/Day 18/day-18-start/main.py b/Day 18/day-18-start/main.py
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+from turtle import Turtle, Screen, colormode
+from random import randint, choice
+
+arrow = Turtle()
+
+# Draw a square
+def square():
+    for i in range(4):
+        arrow.forward(100)
+        arrow.right(90)
+
+# square()
+
+# Draw a dashed line
+def dashed_line():
+    for i in range(20):
+        arrow.forward(10)
+        arrow.penup()
+        arrow.forward(10)
+        arrow.pendown()
+
+# dashed_line()
+
+# Draw a triangle, square, pentagon, hexagon, heptagon, octagon, nonagon, and decagon
+def polygons():
+    colormode(255)
+    for i in range(3, 11):
+        angle = 360 / i
+        color = (randint(0, 255), randint(0, 255), randint(0, 255))
+        arrow.color(color)
+        for j in range(1, i + 1):
+            arrow.right(angle)
+            arrow.forward(100)
+
+# polygons()
+
+# Random Walk (thickness, speed up turtle)
+def random_walk(steps):
+    colormode(255)
+    arrow.pensize(15)
+    arrow.speed(0)
+    for i in range(steps):
+        color = (randint(0, 255), randint(0, 255), randint(0, 255))
+        arrow.color(color)
+        step_size = randint(0, 50)
+        arrow.setheading(choice([0, 90, 180, 270]))
+        arrow.forward(step_size)
+
+# random_walk(1000)
+
+# Spirograph
+def spirograph():
+    colormode(255)
+    arrow.speed(0)
+    heading = 0
+    for i in range(72):
+        color = (randint(0, 255), randint(0, 255), randint(0, 255))
+        arrow.color(color)
+        arrow.circle(200)
+        arrow.setheading(heading)
+        heading += 5
+
+# spirograph()
+
+screen = Screen()
+screen.exitonclick()
diff --git a/Day 18/dot-art/colors_source.jpg b/Day 18/dot-art/colors_source.jpg
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diff --git a/Day 18/dot-art/main.py b/Day 18/dot-art/main.py
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+# # Get color palette from an image
+# import colorgram
+
+# color_list = []
+# colors = colorgram.extract('colors_source.jpg', 30)
+# for color in colors:
+#     r = color.rgb.r
+#     g = color.rgb.g
+#     b = color.rgb.b
+#     new_color = (r, g, b)
+#     color_list.append(new_color)
+# print(color_list)
+
+from turtle import Turtle, Screen, colormode
+import random
+
+arrow = Turtle()
+
+color_list = [
+    (221, 144, 96),
+    (165, 57, 88),
+    (68, 84, 153),
+    (100, 167, 208),
+    (154, 66, 54),
+    (109, 176, 128),
+    (195, 76, 113),
+    (209, 123, 155),
+    (222, 90, 66),
+    (233, 163, 188),
+    (238, 223, 97),
+    (107, 117, 187),
+    (176, 184, 224),
+    (141, 210, 221),
+    (84, 95, 88),
+    (163, 139, 49),
+    (58, 173, 186),
+    (67, 54, 96),
+    (234, 171, 155),
+    (166, 206, 188),
+    (154, 35, 49),
+    (91, 159, 124),
+    (189, 27, 24),
+    (65, 55, 64),
+    (56, 49, 71),
+    (71, 56, 49),
+]
+
+# Set arrow starting position
+arrow.hideturtle()
+arrow.speed(0)
+arrow.penup()
+arrow.sety(-250)
+arrow.setx(-250)
+arrow.width(20)
+
+# Create dots
+colormode(255)
+number_of_dots = 100
+for i in range(1, number_of_dots + 1):
+    arrow.pendown()
+    arrow.dot(20, random.choice(color_list))
+    arrow.penup()
+    arrow.forward(50)
+    if i % 10 == 0:
+        arrow.penup()
+        arrow.backward(500)
+        arrow.left(90)
+        arrow.forward(50)
+        arrow.right(90)
+
+screen = Screen()
+screen.exitonclick()